Microchemistry of copper infiltrated iron powder compacts
Ganguly, Bidyut Kumar
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https://hdl.handle.net/2142/46440
Description
Title
Microchemistry of copper infiltrated iron powder compacts
Author(s)
Ganguly, Bidyut Kumar
Issue Date
1971
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
iron powders compacts
Language
en
Abstract
Iron powders compacts infiltrated with an copper-cobaltzinc mixture (New Jersey Zinc 2044 infiltrant) were analyzed by the electron microprobe for distribution of the iron, copper
and cobalt. It was found that the copper contains a few percent dissolved iron distributed uniformly and the iron
grain containff several percent copper. There was also observed the segregation of cobalt in a thin (1-2 μm) layer at the interface. Since this interface was too thin for detailed analysis by the electron microprobe, thick interfaces were prepared by irmnersing iron plates in liquid infiltrant at 2050°F for times between 1 and 25 hours. These samples had thicker regions between the iron and copper where cobalt was found to be segregated (Co level as high as 30%). The
grains of iron were found to be separated from the plate by the action of copper penetrating down the grain boundaries.
This interface material was found to be very hard. Tensile specimens made from the infiltrated compacted powders were
subjected to tension inside the scanning electron microscope. Deformation of the polished surface of the compact was observed
in the scanning electron microscope while an increasing load was applied to the specimen from outside and it was found that deformation of the iron grains was more readily observed than that of the copper infiltrant as there were evidences
of heavy slipping in the iron. Slip line fonnation in the iron was found to be followed by the tilting of copper
grains which were sliding at the grain boundaries simultaneously. The fractures of samples slow cooled from the infiltration temperature were ductile.
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